Type-writer platen.



z. e. snows.

TYPE WRITER PLAIEN.

APPLICATION FILED DEC. 8,1914.

" Patented De0.28,1915.

w mm

TYPE-WRITER PLATTER.

..m Specification of Letters Patent.

isieaaeo.

Patented Dec. fit, lt flfi.

Application filed December 8, 1914. Serial N 0. 876,028.

To all whom it mag concern Be it known that I, ZALMON citizen of the United States, residing at Wi lmington, in the State of Delaware, have invented-certain new and useful Improvements 1n Type-Writer Platens;

A and l do hereby declare the following to be a full, clear, and

exact description of the invention, such as the art to which a will enable others skilledin it appertains to make and use the.same.'

lthas long been an important desidera' turn in the typewriter art toprovide a platen which should be substantially silent in operation, while not involving any diminution of lightness or of wearing qualities.

My present invention is intended to supplythis need in a form easily constructed and of low expense. a

The accompanying drawing is a median longitudinal section of a platen made in accordance with my invention.

I have found th tion known as printers roll, when provided with the usual rubber or equivalent outer casing or covering is adapted under certain circumstances to produce a platen which makes practically no sound when struck by the types of an ordinary writing machine. Where this substance is used by itself,.however, it has certain disadvantages in practice, one of these being the undesirable weight of the platen so made. In seeking to overcome these disadvantages I have discovered that a platen of suitable lightness and otherwise commercially satisfactory can be made by using a body composed of ground pith, such as grows in corn stalks, rushes, etc, bound together by an admixture of printers rolli orequivalent amorphous and gelatinous material of suitable hardness. capable of softening materially when heated. The binding material is added in suflicient quantity to make it possible to pour the composition into place when suitably heated, but one should not use enough to make the platen too heavy. The ideal proportions should involve using a large majority by volume of pith, and just enough binder to form a body of the proper consistency. The composition of the binder should be such that it will not soften unduly when subjected to the degrees of heat to be expected in practice.

G. SHoLEs, a

at the material or composi sun flower stems, bul- I do not limit myself to any specific mode of building upthe platen, but my preferred method is 'tion' with the accompanying drawing.

inner hollow 'core 10 is provided which is made with a fixed head 11 at opposite end, a similar, 12. The usual rubber covering or casing 13 is secured .in any suitable manner to the fixed head 11, and then the space between this covering and the inner core 10 is filled with the pith and binder composition 14: above described. This composition is softened by heat and is flowed or forced into place in such Well known manner as will insure complete expulsion ofa-irfrom the space to be filled. Enough room is left at the top (or the right hand end in the drawing) 'to ac commodate the removable head 12. Finally this head is inserted in place as shown in the drawing and is fixed in any suitable manner, as, for instance, by pins 15. The accessory parts applied to the platen to pre'- pare it for use in the finished machine may be-of any suitable or well known character, and need no description here, as they form no part of the present invention. i

What I claim is' 1. A platen for typewriting machines comprising a core, a cylindrical layer of composition surrounding said core consisting of comminuted pith and a binder therefor, and an outer layer of suitable material surrounding said layer of pith, substantially as described.

2. A platen for typewriting machine comprising a core, a cylindrical sition surrounding said core consisting of comminuted pith mixed with the composition known as, printers roll as a binder therefor, and an outer layer of suitable material surrounding aid layer of pith, substantially as described.

In testimony whereof, I aflix ture, in presence of two' Witnesses.

' .ZALMON e. SHOLES.

one end, and, at the but removable head or equivalent outer fixed in place, being :Guo. Banana.

Copies ot'ithis patent may be obtained for five cents each, by addressing the "Commissioner of Patents,- Washington, JD. 6.",

layer of compomy signa' described hereinafter in connec' preferably of wood and is provided 

